I am very interested in the topic of dark matter. Mr Loeb brought up how dark matter is a big source of uncertainty as we can’t be certain how it will behave in the future. This is an interesting topic which brings about a question of if there are topics in different areas of knowledge like life sciences which present such a huge source of uncertainty due to their scarcity (inability to conduct experiments with it). It is interesting to think that there is a thing such as dark matter which plays a role in many different models yet is so unpredictable.
Video: https://www.labxchange.org/library/items/lb:HarvardX:c1543a73:lx_simulation:1?fullscreen=true